TCA965B
TCA965B - Window Comparator, 4.5-30 V, 14-DIP | Infineon
The Infineon Technologies TCA965B is a bipolar window discriminator with two adjustable window settings, adjustable hysteresis, and two open-collector digital outputs rated for 50 mA. Its verified supply range is 4.5 V to 30 V, and the specified commercial package is the 14-pin PG-DIP-14-1 through-hole package. The device indicates whether an input voltage is below, inside, or above a defined comparison window.
A window comparator is a specialized comparator integrated within the broader voltage-comparator and analog-interface hierarchy. Instead of providing only one switching threshold, it evaluates an input against two limits and reports when that input lies outside the acceptable band. This makes the TCA965B useful for voltage supervision, tracking control, dead-band control, and DC-voltage selection tasks identified in the manufacturer documentation.
The window edges can be configured directly, or the window can be established indirectly from its center voltage and half-width. Adjustable hysteresis reduces output chatter when the monitored voltage changes near an edge, while an adjustable reference supports threshold calibration. The open-collector outputs permit wired logic, relay interfaces, and pulled-up buses, but external pull-up resistors and suitable sink-current limits are required.
The bipolar implementation supports operation from 4.5 V through 30 V, making the TCA965B appropriate for industrial control systems operating above conventional low-voltage logic rails. Because its outputs are open collector, the device can interface with systems whose logic supply differs from the comparator supply. Designers must account for output rise time, pull-up resistance, load capacitance, and the common-emitter arrangement when wiring the outputs.
Typical uses include power-supply sequencing, battery-voltage qualification, tracking power controllers, process-control dead-band monitors, and DC-voltage selection within an allowed tolerance. In each circuit, the two window references determine acceptance limits while the digital outputs report undervoltage, in-window, and overvoltage conditions. The principal tradeoff is that the legacy 14-DIP package is larger than modern surface-mount alternatives, but it supports straightforward prototyping and through-hole assembly.
When designing around the TCA965B, begin with the verified supply requirement, configure the reference and window network using the manufacturer guidance, and confirm every output pull-up voltage. Do not assume logic-level compatibility from the 30 V supply capability because the open-collector pins do not actively drive a high output. Check hysteresis against noise and load-transient requirements, then validate the complete threshold system across temperature and supply variation.
This page combines the verified manufacturer and distributor records with package, application, comparison, and design guidance. It also distinguishes verified facts from unavailable electrical details rather than estimating unstated thresholds, propagation delays, package dimensions, or prices.
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